Machine-drill.



No. 801,805. PATENTED OCT. 10, 1905. W. MEISSNER.

MACHINE DRILL.

APPLICATION IILED JAN.2.1900.

B2 06 717077" waldcrrmrifgmrzar, n zz07 91 NITED STATES PATENT OFFICE.

\VALDEMAR MEISSNER, OF CHARLOT"ENBURG, GERMANY, ASSIGNOR TO SIEMENS &HALSKE ELEC'RIC COMPANY OF AMERICA, OF CHICAGO, ILLINOIS, A CORPORATIONOF ILLINOIS.

MACHINE-DRILL.

Specification of Letters Patent.

Patented Oct. 10, 1905.

Application filed January 2, 1900. Serial No. 123.

To a]? 1N1 out it may concern.-

Be it known that I, WALDEMAR MEIssNnn, a subject of the Emperor ofGermany, residing at Charlottenburg, Germany, have invented a certainnew and useful Improvement in Machine-Drills, (Case No. 275,) of whichthe following is a full, clear, concise, and exact description,reference being had to the accompanying drawing, forming a part to ofthis specification.

My invention relates to machine-drills, and particularly to that classof drills known as rotary drills, and has for its main object theconstruction of a drill wherein the drill [5 member may be constantlyrotated and the provision of supplemental means interposed between thesource of motive power and the drill for effecting its advance andwithdrawal without stopping the operation of the appa- 2o ratus.

In the preferred embodiment of my invention I employ a drill member,preferably a drill-chuck, which is threaded. This chuck receives thedrill at one end and is provided with means for effecting its rotation,and thereby the rotation of the drill. In order to feed the drill as itrotates, I provide a threaded sleeve for the chuck-stem, which is alsothreaded, the drill being advanced toward 0 the work by reason of theengagement of the threads upon its chuck with the threads of the sleeve.tion I so construct and arrange the said sleeve and mechanism inassociation therewith that 3 5 I am enabled to govern and vary therelative speed and direction of rotation of the sleeve and drill, sothat the drill may be inserted or withdrawn without stopping theapparatus. The sleeve is also preferably arranged to be rotated by thesame power that rotates the drill in a direction to cause a slow advanceof the drill, the relative rotation of the sleeve and drill, beingreversed to effect a rapid withdrawal of the drill.

4 5 I will point out my invention particularly in the claims and willmore fully explain the same by reference to the accompanying drawing,which shows a longitudinal sectional elevation of a drilling apparatusconstructed in accordance with the invention.

The drill a may be of any kind suited to the work that is to be done andis held by a suit- In accordance with the inven-' able chuck b. The stem0 of the chuck is threaded, a left-hand thread being in this instanceshown, as the drill is designed to be 5 5 turned toward the right ineffecting its work, the threads upon the stem receiving the force of theaxial thrust more squarely than they were righthand threads. If thedrill were to be rotated toward the left in its operation, which isusually not done, the threads upon the chuck-stem should be right-handthreads for the same reason. In the form of machine shown there is adriving-sleeve d, which is preferably rotated through the agency of apulley e, that may be operated by any suit able form of prime mover. Anelongated keywayf is provided in the chuck-stem and has engagement witha key g, carried by the sleeve or shaft (1, whereby the drill-chuck anddrill are caused to rotate with the driving-sleeve, while being at thesame time capable of longitudinal movement thereof to permit the drillto be advanced toward or from the work.

The d riving-sleeve is provided with a large gear-wheel h, preferablysecured thereto by means of a key, as shown. This gear-wheel engages asmall pinion 1', preferably rigidly secured to a second pinion c, thepinions being preferably mounted upon a common shaft Z, ournaled in thecasing 'm of the machine. A second gear-wheel n, larger than the pinionsi and ls, but smaller than the gear-wheel h, is loosely mounted upon themember 0, which is capable of effecting the longitudinal movement of thedrill. This member is preferably in the form of a sleeve threaded uponits interior, the threaded stern of the chuck passing through andengaging the threaded bore of the sleeve. In the form shown the wheel ais loosely mounted upon an annular shoulder p, a longitudinally-movableclutch q serving to secure a fixed engagement between the wheel a andthe sleeve 0 5 when moved to the right by being brought into engagementwith a corresponding clutch g, carried by the wheel, the said clutchserving to release the said engagement when moved to the left, theclutch at the same time engaging a corresponding clutch (1 carried bythe frame m, to check and stop the rotation of the sleeve 0.

The casing wt preferably incloses most of the working parts, the casingserving as means for supporting the mechanism upon any suitable support.

The sleeves 0 and d and the gear-wheels n and h are all preferablycoaxial, the wheels h and n being separated by a roller-bearing s.

It will be apparent from an inspection of the drawing that the clutch (1serves as a means for connecting the shaft (1 With the sleeve 0 whensaid clutch is moved toward the right, whereby through the agency of thegearing h i k n the said sleeve is caused to rotate in the samedirection (which is that indicated by the arrow) with'the shaft, but ata more rapid rate of speed. By this means the drill is permitted only toadvance slowly toward -the work. By changing the relative rotation orthe relative directions of rotation of the chuck-stem and the sleeve0that is, instead of having them rotate relatively in the same directioncause them to rotate relatively in opposite directionsI am enabled toeffect the withdrawal of the drill without stopping the apparatus andwithout changing the direction of rotation of the drill. This Ipreferably accomplish by stopping the rotation of the sleeve 0, whichmay be accom plished by moving the clutch q to the left to disconnectthe sleeve 0 from the shaft (1 and at the same time engage the clutch Qwith the clutch g to check and stop the rotation of the sleeve 0. Forthis purpose I preferably employ a manually-operated means, though I donot wish to be limited to such means. The device that I prefer to employis in the form of a hand-lever t, pivotally mounted upon the casing ofthe machine. The nose of this lever engages a longitudinally-movable andnon-rotatable sleeve u, located between the gearing and the chuck b, thesaid sleeve inclosing the contiguous sleeve portion of the casing m.This sleeve is provided with a pair of pins '0 a), which project throughlongitudinal recesses in the casing m and radially inward toward thedrill, the inner ends of these pins engaging a secondlongitudinally-movable and non-rotatable sleeve w, intervening betweenthe casing m and the threaded sleeve 0. The inner end of the sleeve tois provided with an outwardlypr0- jecting collar to. A collar w isscrewed upon the longitudinally movable clutch member the collar beingprovided with an interiorly-projecting flange, between which and theclutch g the collar w is engaged. A coiled spring as is interposedbetween an end wall of the casing m and the sleeve to, the springserving normally to thrust the sleeve w, with its collar w toward thegearing, thereby eifecting an engagement between the clutch Q and thegear-wheel it, thus engaging the driving-shaft d with the sleeve 0through the agency of the gearing, which causes the sleeve 0 to rotatein the same direction with but somewhat faster than the shaft d. The

sleeve 0 by rotating in the same direction with but faster than thedrill-chuck causes the latter to be forced forward. When the drill is tobe withdrawn, I prefer to reverse the relative movements of thedrill-chuck and sleeve 0 by stopping the rotation of the latter. Thismay be accomplished by moving the lever 25 in the direction indicated bythe arrow, which through the agency of the sleeves u and w and thepins 1) 1) effects a longitudinal movement of the clutch q to cause itsdisengagement from the clutch g and to effect the engagement of clutch gwith the clutch member g which, being stationarily mounted upon thecasing m, stops the rotation of the sleeve 0. After the drill has beenwithdrawn its position with reference to the work is readjusted, theclutch members g g are disengaged by moving the lever in the reversedirection, and the drill is again ed forward upon the engagement of theclutch parts 9 g effected by the spring as. 7

If the clutch members q and g were held in engagement too long, thedrill-chuck would be moved too far to the rear, thereby causingbreakage. I therefore provide an abutment y, against which thechuck-head b may impinge, a longitudinal movement of the clutch q awayfrom the clutch g being thereby effected upon the consequentlongitudinal movement of the sleeves u and w.

It is obvious that a large variety of clutch devices and many differentarrangements of gearing may be employed and that various features ofconstruction may be modified without departing from the spirit of myinvention, and I do not, therefore, wish to be limited to the preciseconstruction shown; but,

Having thus described my invention, I claim as new, and desire to secureby Letters Patent, the following:

1. In a drilling-machine, the combination with a threaded member forsupporting the drill, of driving means for rotating the said member in asingle direction, a threaded sleeve engaging the threaded member,gearing interposed between the driving means and said sleeve forrotating the sleeve in the same direction with, and faster than, thedrill, said sleeve being adapted, when thus rotated, to feed the drilltoward the work, a clutch rotating with the sleeve, for connecting saidsleeve with and disconnecting it from the gearing, and a fixed clutchmember adapted for engagement with the aforesaid clutch and cooperatingtherewith to stop the rotation of the sleeve, substantially asdescribed.

2. In a drilling-machine, the combination with a threaded member forsupporting the drill, of driving means for rotating the said member in asingle direction, a threaded IIO sleeve engaging the threaded member,gearing interposed between the driving means and said sleeve forrotating the sleeve in the same direction with and faster than thedrill, said sleeve being adapted ,when thus rotated, to feed the drilltoward the work, a clutch ro tating with the sleeve and movablelongitudinally thereof for connecting said sleeve with and disconnectingit from the gearing, a fixed clutch member adapted for engagement withthe aforesaid clutch and cooperating therewith to stop the rotation ofthe sleeve, a spring for actuating the movable-clutch in one directionand means for actuz'iting the movable clutch in opposition to saidspring, substantially as described.

3. In a drilling-machine, the combination with a threaded member forsupport-ing the drill, of driving means for rotating the said member ina single direction, a threaded sleeve engaging the threaded member,gearing interposed between the driving means and said sleeve forrotating the sleeve in the same direction with and faster than thedrill, said sleeve being adapted, when thus rotated, to feed the drilltoward the work, a clutch rotating with the sleeve and movablelongitudinally thereof for connecting said sleeve with and disconnectingit from the gearing, a fixed clutch member adapted for engagement withthe aforesaid clutch and cooperating therewith to stop the rotation ofthe sleeve, a spring for actuating the movable clutch in one directionand a hand -lever for actuating the movable clutch in opposition to saidspring, substantially as described.

4. In a drilling-machine, the combination with a threaded member forsupporting the drill, of driving means for rotating the said member in asingle direction, a threaded sleeve engaging the threaded member,gearing interposed between the driving means and said sleeve forrotating the sleeve in the same direction with and faster than thedrill, said sleeve being adapted, when thus rotated, to feed the drilltoward the work, a clutch rotating with the sleeve and movablelongitudinally thereof for connecting said sleeve with and disconnectingit from the gearing, a fixed clutch member adapted for engagcment withthe aforesaid clutch and cooperating therewith to stop the rotation ofthe sleeve, a spring for actuating the movable clutch in one directionto connect the gearing with the sleeve to rotate the same and ahand-lever for actuating the movable clutch in opposi tion to saidspring to stop the rotation of the sleeve, substantially as described.

5. In a drillingmachine, the combination with a threaded member forsupporting the drill, of driving means for rotating the said member in asingle direction, a threaded sleeve engaging the driving member, gearinginterposed between the driving means and said sleeve for rotating thesleeve in the same direction with and faster than the drill, said sleevebeing adapted, when thus rotated, to feed the drill toward the work, aclutch rotating with the sleeve and movable longitudinally thereof forconnecting said sleeve with and disconnecting it from the gearing, afixed clutch member adapted for engagcment with the aforesaid clutch andcooperating therewith to stop the rotation of the sleeve, a spring foractuating the movable clutch in one direction to connect the gearingwith the sleeve to rotate the same, a handlever for actuating themovable clutch in opposition to said spring to stop the rotation of thesleeve, and a buffer connected with the movable clutch adapted to beengaged by the drill-supporting member when it ap proaches the limit ofthe rearward movement to disconnect the movable clutch member from thestationary member, substantially as described.

6. In combination, a threaded shaft, a rotatable bearing for said shaftin threaded engagement therewith, means for rotating the shaftcontinuously in one direction, means for rotating the bearing in thesame direction but faster than the shaft to cause a lon gitudinalmovement of the shaft in the one direction, and means for locking thebearing against movement to produce a longitudinal movement of the shaftin the opposite direction.

7. In combination, a threaded tool-carrying member, a rotatable bearinghaving a threaded engagement with said member, means for continuouslyrotating said toolcarrying member in one direction, driving means forrotating said bearing relative to the tool-carrying member, a fixedclutch member, a movable clutch member sleeved on said bearing, andmeans for moving said movable clutch member longitudinally in onedirection to connect the bearing to said driving means and in theopposite direction to connect the bearing to the fixed clutch member.

8. In combination, a threaded shaft, means for continuously rotating theshaft in one direction, a bearing for the shaft in threaded engagementtherewith, speed-increasing gearing, and means for obtaining a relativerotation of the bearing relatively to the shaft in one direction or theother at will, said last-mentioned means comprising means for lockingsaid bearing against rotation or for connecting said bearing to saidshaft by said speed-increasing gearing.

9. In combination, a rotatable threaded shaft, a bearing for said shaftin threaded engagement therewith, a member concentric with said shaftand geared thereto to run in the same direction but faster than theshaft, a fixed clutch member, a movable clutch member connected to saidbearing to my name this 24th day of October, A. D.

turn With it, and means for moving said mov- 1899.

able clutch member in one direction to lock the bearing to saidconcentric member or to WALDENLAR MEISSNER' 5 move it in the oppositedirection to lock it Witnesses:

to said fixed clutch member. 1 RICHARD OPoLoWrrz,

In Witness whereof I hereunto subscribe M. HANNKE.

